a lot of dvd players have some sequence of button pushes to make them all region, google your model.
for the pc you can get utils that sit in the background and unprotect dvds, like http://www.slysoft.com/en/anydvd.html
ok but i think further studies showed that smokers who only supplemented biotin had an increased risk of lung cancer whereas smokers who supplemented biotin with a combination of antioxidants didn't. as far as bone problems i'm more worried about excess protein but to each their own.. anyway all...